Segmented Structure Design of Carbon Ring In-Plane Embedded in g-C3 N4 Nanotubes for Ultra-High Hydrogen Production.
ChemSusChem
; 15(20): e202201268, 2022 Oct 21.
Article
em En
| MEDLINE
| ID: mdl-36031750
ABSTRACT
The photocatalytic water splitting capability of metal-free graphitic carbon nitride (g-C3 N4 ) photocatalyst is determined by its microstructure and photoexcited electrons transfer. Herein, a segmented structure was developed, consisting of alternant g-C3 N4 nanotubes and graphitic carbon rings (denoted as Cr -CN-NT). The Cr -CN-NT showed ordered structure and ultralong length/diameter ratio of 150â
nm in diameter and a few microns in lengths, which promoted electron transport kinetics and elongated photocarrier diffusion length and lifetime. Meanwhile, the local in-plane π-conjugation was formed and extended in Cr -CN-NT, which could improve charge carrier density and prohibit electron-hole recombination. Accordingly, the average hydrogen evolution rate of Cr -CN-NT reached 9245â
µmol h-1 g-1 , which was 61.6 times that of pristine CN, and the remarkable apparent quantum efficiency (AQE) of Cr -CN-NT reached up to 12.86 % at 420â
nm. This work may provide a pathway for simultaneous morphology regulation and in-plane modification of high-performance photocatalysts.
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MEDLINE
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En
Ano de publicação:
2022
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Article